<template>
  <!-- 头部区域 -->
  <el-container class="home-container">
    <el-header>
      <div>
        <img src="../assets/css/heima.png" alt />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse?'64px':'200px'">
          <div class="toggle-button" @click="toggleCollapse()">|||</div>
          <!-- 侧边栏菜单区 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409EFF" unique-opened :collapse='isCollapse' :collapse-transition="false" router  :default-active='activePath'>
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
              <!-- 一级菜单的模板区域 -->
            <template slot="title">
                <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path " v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                <template slot="title">
                <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
            </template>
            </el-menu-item>
            
          </el-submenu>
          
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main>
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
    data(){
        return{
            //左侧菜单数据
            menulist:[],
            iconsObj:{
                '125':'iconfont icon-user',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-danju',
                '145':'iconfont icon-baobiao'
            },
            //是否折叠
            isCollapse:false,
            //被激活的链接地址
            activePath:''

        }
    },
    created(){
       this.getMenuList()
       this.activePath = window.sessionStorage.getItem('activePath')
    },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
    },
    //获取所有菜单
    async getMenuList(){
       const{data:res} =  await this.$http.get('menus');
       if(res.meta.status !==200) return this.$message.error(res.meta.msg);
       this.menulist = res.data;
    },
    //点击按钮切换菜单的折叠与展开
    toggleCollapse(){
       this.isCollapse=!this.isCollapse
    },
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath
    }
  }
};
</script>

<style lang='less' scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #333744;
  .el-menu {
      border-right: none;
  }
}

.el-main {
  background-color: #eaedf1;
}

.iconfont {
    margin-right: 10px;
}

.toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color:#fff;
    text-align: center;
    letter-spacing: 0.3em;
    cursor: pointer;
}
</style>